-You've finished the main story, when you continue it will start at the beginning of the orb chamber
-If you 'Continue Game' in a FC, you'll probably start the Orb Chamber.
-Start new game in Disponentia and save/exit

You'll need to create a full conversion mod, with a 'models' folder inside, with the flashlight and make the recources file lead to /yourfc/models
There's a full tutorial by the creator of White Night on ModDB